Material Upgrade :The accessories are newly upgraded to ensure that the handle will not sag or break after long-term use. The modern door handles are made of high-quality zinc alloy and brass components, which will not rust in high humidity environment. Privacy Function Without Keys :The privacy door handles are interiored with a push button button (lock and unlock) and exteriored with emergency release hole. If baby is locked inside accidentally, the outside can unlock the door with a needle, no key needed. Easy Installation :All you need is a door and a screwdriver and you can install it in minutes! No need for a professional door installer, you can do it yourself! Suitable Door Thickness :Fit for most standard door thickness from 1-3/8 to 1-3/4 inch (35mm-45mm) and adjustable latch 2-3/8" or 2 3/4" (60mm or 70mm). Allow to replace your door Handles without rework on the door frame.